What's the meaning of "learned a thing or twelve"?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Mysterious Puzzle

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Chapters
00:00 What'S The Meaning Of &Quot;Learned A Thing Or Twelve&Quot;?
00:16 Accepted Answer Score 11
00:58 Answer 2 Score 0
01:25 Thank you

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Full question
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Tags
#meaning #idioms

#avk47